Effect of alloying with titanium on the microstructure of an oxide dispersion strengthened 13.5% Cr steel

• Published in: Physics of metals and metallography Vol. 115; no. 12; pp. 1259 - 1266
• Main Authors: Rogozhkin, S. V., Bogachev, A. A., Kirillov, D. I., Nikitin, A. A., Orlov, N. N., Aleev, A. A., Zaluzhnyi, A. G., Kozodaev, M. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.12.2014; Springer Nature B.V
• Subjects: Alloy steels; Chemistry and Materials Science; Chromium; Density; Dispersion hardening alloys; Dispersions; Materials Science; Metallic Materials; Nanostructure; Strength and Plasticity; Structural steels; Titanium; structural materials for nuclear engineering; transmission electron microscopy; oxide dispersion strengthened steels; alloying additives
• ISSN: 0031-918X; 1555-6190
• DOI: 10.1134/S0031918X14120060

Microstructure and phase composition of a high-chromium oxide dispersion strengthened (ODS) steel Fe-13.5% Cr-2% W-0.3% Y 2 O 3 without a titanium additive, as well as alloyed with 0.2, 0.3, and 0.4 wt %Ti, has been studied using transmission electron microscopy. A comparison of the nanoscale state of the steels under investigation with that of an ODS Eurofer steel alloyed with 0.2 wt % V has been carried out. In all of the states found, a high number density of nanosized oxide inclusions has been observed. Upon an increase of the titanium concentration in the steel Fe-13.5% Cr-2% W-0.3% Y 2 O 3 to 0.3 wt %, the average size of the particles decreases, while their number density grows. In this steel, single nanosized (0.1–0.7 μm) grains or their agglomerates have been found, as well as coarse (6–8 μm) grains.